Study on dynamic assessment method and application of rockburst risk under high crustal stresses in western Sichuan
A dynamic assessment method for rockburst risk in tunnels is proposed in response to the complex construction conditions of high ground stress tunnels,which make it difficult to assess rockburst risk.Fault tree analysis method is adopted to identify rockburst risk sources and to screen risk assessment indicators.Based on the risk matrix method,the values of probability level and severity level are expanded from discrete points to a range,refining the classification criteria and constructing a risk level assessment regional map.The dynamic assessment model for rockburst risk is established by introducing the concept of dynamic weight based on the static risk indicator system,thus achieving a finer classification of rockburst probability levels.Taking the Taoziping tunnel as an example,the implementation process of the dynamic assessment method for rockburst risk is discussed.After evaluation,the results are consistent with the actual construction situation.The research can provide theoretical and practical guidance for the risk management of actual tunnel engineering construction and have good application prospects.
rock mechanicshigh crustal stressrockburstrisk assessmentrefinement leveldynamic-weight
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